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Finding the Fourth Proportional to 283.28, 424.51 and 128.82

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Solution

The fourth proportional to 283.28, 424.51 and 128.82 is: 193.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.28 : 424.51 = 128.82 : x
  2. Step 2: Convert to fraction form
    283.28/424.51 = 128.82/x
  3. Step 3: Cross multiply
    283.28x = 424.51 × 128.82
  4. Step 4: Simplify right side
    283.28x = 54,685.38
  5. Step 5: Solve for x
    x = 54,685.38/283.28
  6. Step 6: Final answer
    x = 193.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.